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Geology and mineral resources of the southern half of the Clearfield 15-minute quadrangle, Pennsylvania

Geology and mineral resources of the Hazen, Falls Creek, Reynoldsville, and Dubois quadrangles, Clearfield and Jefferson Counties, Pennsylvania

Digital simulation of the yield potential of the Elliot Park-Burgoon aquifer in eastern Clearfield and western Centre Counties, Pennsylvania

Geology and mineral resources of the Sabula and Penfield quadrangles, Clearfield, Elk, and Jefferson Counties, Pennsylvania